What I would do is create another usergroup based on the Registered usergroup (Registered being the default that all users are put into). Then, I would set the Registered usergroup to not be able to post, but set the new usergroup to be able to post (if you just copied the original Registered group, it should already be that way). Then, move all your trusted users that you want to post into the new usergroup and leave new users in the Registered group (which can't post).
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